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Re: [vfio-users] passthrough VGA for widespread use?

Thanks for the summary / overview.

On gentoo you can place the patches in
/etc/portage/patches/app-emulation/qemu/ without copying and modifying
the qemu ebuild.


Am 01.03.2016 um 15:46 schrieb Jonathan Scruggs:
> The patches apply to Qemu 2.5. You will need to recompile it after applying
> the patches. See your distro's help section on working with source files.
> You should be able to add these to the RPM/DEP/Ebuild scripts easily. There
> are script files inside RPMs and DEBs that tell rpm/deb how to build those
> packages, thus editing that will compile the patches in for you and build
> the installable RPM/DEB.
> The following patches need to be applied in the order listed. They are
> taken from Gerd's qemu work branch. He's a qemu developer, btw. ;)
> https://www.kraxel.org/cgit/qemu/patch/?id=0d60ce8e719b5c49ba69c42080f7724fc7de5c1f
> https://www.kraxel.org/cgit/qemu/patch/?id=f3617dde4efc245313694ec1c48a0c94e3da6632
> https://www.kraxel.org/cgit/qemu/patch/?id=94cf5984085d74b3c1fc9bfb2713c3a931d19d08
> https://www.kraxel.org/cgit/qemu/patch/?id=caef8b88fecf1496fa5b623aa2c08544726e36f7
> https://www.kraxel.org/cgit/qemu/patch/?id=96c8276c04d609e880a0eb01298d73f46585225d
> https://www.kraxel.org/cgit/qemu/patch/?id=9e129397cfd6a733fb4c865e1b605c5c1eb07cff
> https://www.kraxel.org/cgit/qemu/patch/?id=6c1c299b65af44e1d81142efb944a9b1009ad725
> https://www.kraxel.org/cgit/qemu/patch/?id=0767759d388b0f1bdd9b0445b41b4e88bf980ede
> For ebuilds, I added this to the qemu ebuild:
> # Add input patches
> epatch "${FILESDIR}"/${P}-input-01-add-qemu-input.patch
> epatch "${FILESDIR}"/${P}-input-02-linux-evdev-support.patch
> epatch
> "${FILESDIR}"/${P}-input-03-add-option-to-toggle-grab-on-all-devices.patch
> epatch
> "${FILESDIR}"/${P}-input-04-add-name-strings-for-linux-input-layer-defines.patch
> epatch "${FILESDIR}"/${P}-input-05-event-logging-to-stderr.patch
> epatch "${FILESDIR}"/${P}-input-06-catch-and-handle-read-errors.patch
> # epatch "${FILESDIR}"/${P}-input-07-adapt-to-qapi-changes.patch <-- needs
> development branch to work. Don't use.
> epatch "${FILESDIR}"/${P}-input-08-EAGAIN-is-not-fatal.patch
> epatch
> "${FILESDIR}"/${P}-input-09-add-switch-to-enable-auto-repeat-events.patch
> Then in my libvirt xml file, I enabled qemu direct commandline control:
>   <qemu:commandline>
>     <qemu:arg value='-input-linux'/>
>     <qemu:arg
> value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.0-event-kbd,grab-all=on,repeat=on'/>
>     <qemu:arg value='-input-linux'/>
>     <qemu:arg
> value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.1-event-mouse'/>
>     <qemu:arg value='-input-linux'/>
>     <qemu:arg
> value='/dev/input/by-path/pci-0000:00:14.0-usb-0:9.1:1.2-event-joystick'/>
>   </qemu:commandline>
> The Joystick is actually the keypad. I have a Microsoft sculpt set that
> comes with three separate pieces.
> Replace your keyboard and mouse with the correct paths in the
> /dev/input/by-path section.
> It will be cool when the execute program on switch is added, then just
> pressing both CTRL keys will switch monitor inputs as well!
> Jon
> On 1 March 2016 at 12:43, thibaut noah <thibaut noah gmail com> wrote:
>> 2016-03-01 11:08 GMT+01:00 Jonathan Scruggs <j scruggs gmail com>:
>>> I have no lag. The patches make the keyboard/mouse directly available on
>>> the guest as a real device. This way I have one keyboard and mouse for both
>>> host and guest. The technical bit is that the input buffers are forwarded
>>> to the guest. Synergy is nice but there is lag with that. These patches are
>>> real time! I play the latest AAA games too. I haven't noticed anything. It
>>> doesn't hurt to try. I can post my libvirt config if need be. I'll need to
>>> get the git address of the latest version.
>> That is pretty much why my synergy server is on the guest, but i have to
>> swift my mouse every time i boot, not good for the usb ports.
>> Are the patches applied with patch -p1?
>> No kernel recompilation needed?
>> If so could you copy paste them please?
>> That would be indeed glorious, and free 2ports on my usb controller (also
>> i have usb ports dedicated to gaming periph on my motherboard)
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